Climate Change Chart of Hamburg, Germany

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.84 °C compared with the earlier reference period; this is an unweighted mean of the monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in January, with a difference of +4.64 °C. That identifies the strongest increase among the monthly comparisons, rather than implying that every month warmed by the same amount.

Changes in snowfall

Mean daily snowfall showed a difference of -0.27 mm/day when averaged across calendar months. This unweighted mean is not a day-weighted annual average, and the displayed difference should not be taken to mean that snowfall was absent in either period. The largest monthly decrease was in January, with a difference of -1.04 mm/day; the largest increase occurred in May, at a difference of +0.02 mm/day. These are changes in daily mean amounts, not monthly snowfall totals.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, was higher on average across calendar months, with a difference of +0.32 mm/day. The unweighted monthly mean summarizes the aggregate comparison and does not mean rainfall increased in every month. The largest monthly increase was in October, at a difference of +1.11 mm/day, while August had the largest decrease, a difference of -0.36 mm/day. These month-specific changes show that the overall mean accompanies distinct increases and decreases across the monthly comparisons.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.04 hours/day; this unweighted mean is not a day-weighted annual figure, and it does not describe each month individually. The largest monthly increase was in April, with a difference of +0.91 hours/day. By contrast, January recorded the largest decrease, a difference of -0.86 hours/day, illustrating how the month-level comparison can vary around the small overall mean difference.